Send your contact information via SMS and import received SMS into address book. (If your friend is using iPhone, there is a corresponding app to import the SMS as well.) If your friend does not have an iPhone or Android, they can still see the info in clear text and add manually.
*Paid version allows sending of Contacts
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Androlicious.com is a website that shows applications and games from Android Market. You can download and install apps and games directly from Android Market using an Android phone or by using WebConnect mobile application.